Multi-unit cascading is unavailable at sample rates of 176.4 kHz and 192 kHz

DSP Usage

Apollo uses DSP and memory for its internal DSP mixer. Therefore, the UAD meters show some DSP and memory usage even when UAD plug-ins are not in use.

UAD Presets

When logged into the computer under an account that does not have administrator privileges, saving UAD preset files via the UAD Toolbar will result in an "Unable to save preset file" dialog. If this occurs, either log in with an administrator account, or use the DAW's preset management tools.

External Word Clock

To set Apollo to sync to external Word Clock, the setting must be made in the Interface panel within the Console Settings window. If the setting is changed from within the DAW's control panel, the change may not actually be activated even if the DAW indicates the setting is changed.

Windows-Specific Notes

For optimum performance with most DAWs, disabling Windows AERO is recommended.

The session sample rate can only be changed from within the DAW. The Console Settings window cannot be used to change the sample rate.

The "Enable CPU Optimization" option in the UAD Meter & Control Panel application's Configuration panel may need to be disabled when using Pro Tools on Windows systems.

At sample rates of 88.2 kHz and 96 kHz, the smallest available buffer is 64 samples. At sample rates of 76.4 kHz and 192 kHz, the smallest available buffer is 128 samples.

Apollo Console Notes

UAD Powered Plug-Ins within Console use DSP differently than when used within a DAW. To maintain the lowest possible input latency, UAD plug-ins used on a single Console input are “chained” and must fit within a single DSP chip. Therefore, it is possible to get an “DSP load limit exceeded” message even though the UAD Meter may indicate there is plenty of DSP available.

Console Recall session files (configuration presets) saved within Console will not be saved if the "/" (forward slash), "\" (back slash), or "?" (question mark) characters are in the filename. Avoid these and other special characters when saving Recall files.

DAW Use Notes

What is the lowest hardware buffer setting I can use with Apollo for stable operation?

The audio interface hardware I/O portion of Apollo can run at any hardware buffer setting that is stable within the DAW itself. Results may vary as a result of how much the DAW session stresses the computer system. This can be influenced by:

How many processor-intensive native plug-ins (such as virtual instruments, convolution reverbs, etc.) are in the session

When Apollo is connected via the Thunderbolt Option Card, the 512 buffer restriction for UAD plug-in processing over FireWire no longer applies, enabling lower latency for UAD plug-ins running inside the DAW. With Thunderbolt, the buffer size for UAD plug-ins used within the DAW is equal to the DAW’s hardware I/O buffer setting. Additionally, LiveTrack mode can be used with Thunderbolt which lowers latency even further with UAD plug-ins used within the DAW.

Of course, for the lowest possible latency when running UAD plug-ins on live inputs, we recommend using the included Console application to take advantage of Apollo’s unique Realtime UAD Processing feature, where DAW I/O buffering does not apply.

General DAW Notes

(UAD v6.5.2 and lower only) If a DAW session is saved then a Console Recall plug-in adjustment is made, the "Save" menu may be unavailable (gray) even though the plug-in has changed. If this occurs, make any adjustment outside of the plug-in (e.g., toggle any DAW setting) then save the session. This issue is resolved in UAD v7 and higher.

(Win) The "Enable CPU Optimization" option in the Configuration panel of UAD Meter & Control Panel application's Configuration panel may need to be disabled when using Pro Tools on Windows systems.